Photoshop Elements: PSE 6 won't launch

I have been using PSE for appox 2 yrs now. Windows 7 OS. I clicked on to open it the other day...and it will not open. I have inserted the disk to 'repair' it. It goes through the whole wizard set up and then asks me to insert the disk 1. I only have the one disk it came with. I don't know why it will not open up at all now. Should I uninstall it and reinstall it? I don't know why all of a sudden it stopped working. Any help would be GREATLY appreciated. Im frustrated.